Tonometer



FIG. 1 is a front right perspective view of a tonometer showing our new design;

FIG. 2 is a rear left perspective view thereof;

FIG. 3 is a right rear perspective view thereof;

FIG. 4 is a left side view thereof;

FIG. 5 is a right side view thereof;

FIG. 6 is a rear view thereof;

FIG. 7 is a top view thereof;

FIG. 8 is a front view thereof; and,

FIG. 9 is a front left perspective view thereof. 

The ornamental design for a tonometer, as shown and described. 